Study of the first-excited $K^{\pi}=0^{+}$ and $2^{+}$ bands in $^{228}$Th in the $^{226}$Ra$(\alpha,2n)$ reaction

T. Weber; J. Gröger; C. Günther; J. deBoer

doi:doi:10.1007/s100500050029

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A 1, 39-44

Study of the first-excited $K^{\pi}=0^{+}$ and 2⁺ bands in ²²⁸Th in the ²²⁶Ra $(\alpha,2n)$ reaction

T. Weber¹ - J. Gröger¹ - C. Günther¹ - J. deBoer²

¹ Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany
² Sektion Physik, Universität München, Am Coulombwall 1, D-85748 Garching, Germany

Received: 11 August 1997 / Revised version: 19 September 1997 Communicated by D. Schwalm

Abstract
Excited bands of ²²⁸Th were studied in the ²²⁶Ra $(\alpha,2n)$ reaction by gamma-ray and conversion-electron spectroscopy. The first-excited $K^{\pi}=0^{+}$ and 2⁺ bands were identified up to $I^{\pi} = 12^{+}$ and 10⁺, respectively. The spin dependence of the moments of inertia is discussed. The experimental data indicate a structural change of these bands from ²²⁸Th to ²³⁰Th and ²³²Th.